i was on this mission a few years ago. i tried as many as i could in stores. i found the new line of fender rumble amps, the TC electronic BG250's, and the GK MB line to all be amazing. Super lightweight, great power, great tone. i would have been happy with any of the 3, but I found a used (pristine shape) MB212 and couldn't be happier. it is the most expensive, so getting the great deal is the only way I could afford. I did really enjoy the 2x10" and the 1x15" of both the tc electronic and the fender rumble amps though. i actually think i liked the 15's better, if I recall correctly. try to check out all three and see what you like. you are on the right track. i see used bg250's pop up all the time for under $200. a steal in my opinion.
i got my GK for $325, if I recall. If you see a deal like that on a 500watt 2x12, you drive 10 hours round trip in a day to get it.
I agree on the GK MB212. Great sound, great punch. lightweight. Hard to beat!